Electromagnetic valve detection control circuit and air-breathing fire detection system

Abstract

The utility model discloses an electromagnetic valve detection control circuit and an air-breathing fire detection system, and the electromagnetic valve detection control circuit comprises a master control single-chip microcomputer; the main control single chip microcomputer inputs a level control signal to the power chip to control the electromagnetic valve to be opened or closed, and the working state of the electromagnetic valve is determined according to the feedback voltage of the power chip; the falling-off detection circuit is used for providing a trigger current for the control end of the electromagnetic valve according to the control signal of the main control single-chip microcomputer so as to enable the power chip to form a feedback voltage for the main control single-chip microcomputer to obtain the working state of the electromagnetic valve; and the power supply module is used for providing working voltage. According to the utility model, when the electromagnetic valve breaks down, treatment can be carried out as soon as possible, so that when the lithium battery is subjected to thermal runaway, the fire extinguishing action can be accurately triggered, the accuracy and timeliness of triggering the fire extinguishing action are improved, and personnel and property loss is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fire detection, in particular to a solenoid valve detection control circuit and an air suction type fire detection system. Background Art

[0002] At present, lithium battery technology with high energy density is widely used in electric vehicles and energy storage fields. Lithium batteries have advantages such as high efficiency and long life, but they are also prone to safety risks due to overheating, short circuit, overcharging, physical collision, etc., leading to thermal runaway reactions, which in turn cause fires and even explosions. In order to ensure the safety of PACK boxes, energy storage cabinets and energy storage prefabricated cabins, the real-time monitoring system technology of PACK boxes has attracted much attention from users.

[0003] In recent years, the suction detection device has been more widely used. It is installed outside the PACK, and the battery box does not need to be disassembled for operation and maintenance, so the operation and maintenance cost is low. The suction detection device extracts the combustible gas, smoke and oxygen in the PACK through the sampling pipeline for analysis, and then determines whether to control the solenoid valve of the fire extinguishing to open for fire extinguishing based on the analysis results. Therefore, how to accurately monitor and control the solenoid valve on the pipeline of the fire extinguishing system and detect the state of the solenoid valve in the suction detection device is a key link to ensure the accuracy of fire extinguishing control.

[0004] In the prior art, the high and low level signals are generally output through the IO port of the single-chip microcomputer to control the solenoid valve to inert the battery box or inflate and inhale the combustible gas and release the fire extinguishing agent. Since the working voltage of the single-chip microcomputer is 3.3V or 5V, and the working voltage of the automobile or energy storage is usually more than 12V, the optical coupler is generally used to isolate different power supplies and then control the solenoid valve.

[0005] Although this control method isolates different power supplies, it cannot provide feedback on the working status of the solenoid valve. Once the solenoid valve fails, such as falling off or short-circuiting, the fire detection system cannot identify the fault, resulting in missed reports, false triggers, etc. In the case of a solenoid valve failure, even if the need for inerting, inflating, suctioning, and spraying fire extinguishing agents for the battery box is accurately identified, and the thermal runaway of the lithium battery is identified, the solenoid valve cannot be opened in time for inert gas inflation, gas extraction analysis, and release of fire extinguishing agents, resulting in untimely fire extinguishing, causing loss of life and property. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a solenoid valve detection control circuit and an aspiration type fire detection system, which have the advantages of being able to timely feedback the working status of the solenoid valve and improve the accuracy and timeliness of triggering the fire extinguishing action.

[0007] The purpose of the utility model is achieved by the following technical solutions:

[0008] According to a first aspect of an embodiment of the present disclosure, there is provided a solenoid valve detection control circuit, comprising:

[0009] Main control microcontroller;

[0010] A power chip, wherein the input end of the power chip is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve. The main control microcontroller controls the opening or closing of the solenoid valve by inputting a level control signal to the power chip, and determines the working state of the solenoid valve according to the feedback voltage of the power chip;

[0011] A shedding detection circuit, wherein the input end of the shedding detection circuit is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve, and is used to provide a trigger current to the control end of the solenoid valve according to the control signal of the main control microcontroller so that the power chip forms a feedback voltage for the main control microcontroller to obtain the working state of the solenoid valve; and

[0012] The power module is used to provide operating voltage.

[0013] To implement the above technical solution, during normal operation, the main control microcontroller inputs a level control signal to the power chip, and the power chip can control the solenoid valve to open or close according to the level control signal. Usually, when the level control signal is a high level signal, the solenoid valve is controlled to open, and when the level control signal is a low level signal, the solenoid valve is controlled to close; when the system is powered on, the solenoid valve is in a closed state, and the working state of the solenoid valve cannot be judged by the power chip at this time. The main control microcontroller sends a control signal to the shedding detection circuit, and the shedding detection circuit provides a trigger current to the control end of the solenoid valve according to the control signal. The trigger current is a small current and cannot control the opening of the solenoid valve, but the trigger current can be identified by the power chip and form a feedback voltage. At this time, the main control microcontroller can determine the working state of the solenoid valve according to the feedback voltage, and can determine whether the solenoid valve is faulty when the system is powered on, so that the working state of the solenoid valve can be fed back in time, so that the solenoid valve can be processed as soon as possible when a fault occurs, so that when the lithium battery has thermal runaway, the fire extinguishing action can be accurately triggered, thereby improving the accuracy and timeliness of the triggering of the fire extinguishing action and avoiding loss of personnel and property.

[0014] In some exemplary embodiments, the power chip is connected to a load resistor, a first end of the load resistor is connected to a feedback end of the power chip, and a second end is grounded, for converting a current signal at an output end of the power chip into a feedback voltage.

[0015] In some exemplary embodiments, a first current limiting resistor is provided between the output terminal of the main control microcontroller and the input terminal of the power chip.

[0016] By implementing the above technical solution, the output current of the main control microcontroller can be reduced through the first current limiting resistor, thereby preventing the output current of the main control microcontroller from being too large and damaging the input end of the power chip.

[0017] In some exemplary embodiments, a second current limiting resistor is connected between the feedback receiving end of the main control microcontroller and the feedback end of the power chip, and a filter capacitor is connected between the second current limiting resistor and the main control microcontroller, and the second current limiting resistor and the filter capacitor constitute a filter circuit.

[0018] By implementing the above technical solution, the feedback current of the power chip can be reduced through the second current limiting resistor to prevent the feedback current of the power chip from being too large and damaging the feedback receiving end of the microcontroller. At the same time, the second current limiting resistor and the filter capacitor form a filter circuit, which can effectively reduce the noise in the signal feedback process.

[0019] In some exemplary embodiments, the fall-off detection circuit includes:

[0020] An optical coupler, the input end of the optical coupler is connected to the output end of the main control microcontroller; and

[0021] A switch circuit, wherein the input end of the switch circuit is connected to the output end of the optical coupler, and the output end is connected to the control end of the solenoid valve.

[0022] To implement the above technical solution, the control signal of the main control microcontroller can be transmitted unidirectionally through the optical coupler, and then the switch circuit is turned on to output a trigger current to the control end of the solenoid valve.

[0023] In some exemplary embodiments, the switch circuit includes a transistor, a base of the transistor is connected to the output end of the optocoupler, an emitter is connected to a power module, and a collector is connected to a control end of the solenoid valve.

[0024] According to a second aspect of an embodiment of the present disclosure, there is provided an air suction fire detection system, comprising the solenoid valve detection control circuit as described in the first aspect.

[0025] In summary, compared with the prior art, the utility model has the following beneficial effects:

[0026] The utility model embodiment provides a solenoid valve detection control circuit and an air suction fire detection system, wherein the solenoid valve detection control circuit includes: a main control microcontroller; a power chip, wherein the input end of the power chip is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve, and the main control microcontroller controls the opening or closing of the solenoid valve by inputting a level control signal to the power chip, and determines the working state of the solenoid valve according to the feedback voltage of the power chip; a fall-off detection circuit, wherein the input end of the fall-off detection circuit is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve, and is used to provide a trigger current to the control end of the solenoid valve according to the control signal of the main control microcontroller so that the power chip forms a feedback voltage for the main control microcontroller to obtain the working state of the solenoid valve; and a power supply module, which is used to provide a working voltage. During normal operation, the main control microcontroller inputs a level control signal to the power chip, and the power chip can control the solenoid valve to open or close according to the level control signal. Usually, when the level control signal is a high level signal, the solenoid valve is controlled to open, and when the level control signal is a low level signal, the solenoid valve is controlled to close. When the system is powered on, the solenoid valve is in a closed state. At this time, the working state of the solenoid valve cannot be judged by the power chip. The main control microcontroller sends a control signal to the shedding detection circuit. The shedding detection circuit provides a trigger current to the control end of the solenoid valve according to the control signal. The trigger current is a small current and cannot control the opening of the solenoid valve. However, the power chip can identify the trigger current and form a feedback voltage. At this time, the main control microcontroller can determine the working state of the solenoid valve according to the feedback voltage, and can determine whether the solenoid valve is faulty when the system is powered on, so as to timely feedback the working state of the solenoid valve, so as to handle the fault of the solenoid valve as soon as possible, so that when the lithium battery has thermal runaway, the fire extinguishing action can be accurately triggered, thereby improving the accuracy and timeliness of the triggering of the fire extinguishing action and avoiding loss of personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a circuit schematic diagram of the solenoid valve detection control circuit in the embodiment of the utility model.

[0028] The numbers and letters in the figure represent the corresponding component names:

[0029] U1, main control microcontroller; U2, power chip; R4, load resistor; R1, first current limiting resistor; R2, second current limiting resistor; C2, filter capacitor; U4, optocoupler; Q1, transistor. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 1 As shown, the first aspect of the embodiment of the utility model provides a solenoid valve detection control circuit, including: a main control microcontroller U1; a power chip U2, the input end of the power chip U2 is connected to the main control microcontroller U1, and the output end is connected to the control end of the solenoid valve, the main control microcontroller U1 controls the opening or closing of the solenoid valve by inputting a level control signal to the power chip U2, and determines the working state of the solenoid valve according to the feedback voltage of the power chip U2; a shedding detection circuit, the input end of the shedding detection circuit is connected to the main control microcontroller U1, and the output end is connected to the control end of the solenoid valve, and is used to provide a trigger current to the control end of the solenoid valve according to the control signal of the main control microcontroller U1 so that the power chip U2 forms a feedback voltage for the main control microcontroller U1 to obtain the working state of the solenoid valve; and a power supply module, which is used to provide a working voltage.

[0032] The power chip U2 is connected to a load resistor R4, a first end of the load resistor R4 is connected to the feedback end IS port of the power chip U2, and a second end is grounded, and is used to convert the current signal at the output end of the power chip U2 into a feedback voltage; and a first current limiting resistor R1 is provided between the output end of the main control microcontroller U1 and the input end of the power chip U2, specifically, a first end of the first current limiting resistor R1 is connected to the No. 6 output port of the main control microcontroller U1, and a second end is connected to the No. 4 input port of the power chip U2. The output current of the main control microcontroller U1 can be reduced by the first current limiting resistor R1 to prevent the output current of the main control microcontroller U1 from being too large and damaging the input end of the power chip U2.

[0033] At the same time, a second current limiting resistor R2 is connected between the feedback receiving end ADC port of the main control microcontroller U1 and the feedback end IS port of the power chip U2, and a filter capacitor C2 is connected between the second current limiting resistor R2 and the main control microcontroller U1. The second current limiting resistor R2 and the filter capacitor C2 constitute a filter circuit, wherein the second end of the load resistor R4 and the filter capacitor C2 are grounded at the same time; the second current limiting resistor R2 can reduce the feedback current of the power chip U2 to prevent the feedback current of the power chip U2 from being too large and damaging the feedback receiving end of the microcontroller. At the same time, the second current limiting resistor R2 and the filter capacitor C2 constitute a filter circuit, which can effectively reduce the noise in the signal feedback process.

[0034] The shedding detection circuit includes: an optocoupler U4, the input end of which is connected to the output end of the main control microcontroller U1; and a switching circuit, the input end of which is connected to the output end of the optocoupler U4, and the output end is connected to the control end of the solenoid valve, wherein the switching circuit includes a transistor Q1, the base of the transistor Q1 is connected to the output end of the optocoupler U4, the emitter is connected to the power module, and the collector is connected to the control end of the solenoid valve; specifically: the first input port of the optocoupler U4 is connected to the third input port of the main control microcontroller U1, the second input port of the optocoupler U4 is grounded, the third output port of the optocoupler U4 is grounded, the fourth output port of the optocoupler U4 is connected to the base of the transistor Q1 after being connected to the resistor R6, the emitter of the transistor Q1 is connected to the VBAT end, and a resistor R7 is also connected between the emitter and the base of the transistor Q1, and the collector of the transistor Q1 is connected to the resistor R8 and then connected to the control end POUT port of the solenoid valve. The control signal of the main control microcontroller U1 can be transmitted unidirectionally through the optical coupler U4, and then the switch circuit is turned on to output a trigger current to the control end of the solenoid valve.

[0035] The power module is powered by the VBAT terminal, and the VBAT terminal is also connected to a voltage regulator chip U3 to provide a stable voltage to the entire circuit. The VIN terminal of the voltage regulator chip U3 is connected to the VBAT terminal, the GND terminal is grounded, the VOUT terminal is connected to the VCC terminal and the VDD terminal of the main control microcontroller U1, the VSS terminal of the main control microcontroller U1 is grounded, the VS terminal of the power chip U2 is connected to the VIN terminal of the voltage regulator chip U3, and the GND terminal of the power chip U2 is grounded.

[0036] Ports No. 10, No. 11 and No. 12 of the power chip U2 are connected to the control end POUT port of the solenoid valve, and a resistor R5 and a capacitor C1 are also connected between the power chip U2 and the control end POUT port of the solenoid valve. The resistor R5 and the capacitor C1 are connected in parallel, and the first end of the resistor R5 and the first end of the capacitor C1 are both connected to the main control chip, and the second end of the resistor R5 and the second end of the capacitor C1 are both grounded. A filtering circuit can also be formed by the resistor R5 and the capacitor C1 to achieve the function of noise reduction.

[0037] During normal operation, the main control microcontroller U1 inputs a level control signal to the power chip U2, and the power chip U2 can control the solenoid valve to open or close according to the level control signal. Usually, when the level control signal is a high level signal, the solenoid valve is controlled to open, and when the level control signal is a low level signal, the solenoid valve is controlled to close. At the same time, the main control can also judge the working status of the solenoid valve through the feedback voltage converted by the current signal at the input end of the power chip U2 through the load resistor R4.

[0038] When the system is powered on, the solenoid valve is in a closed state. At this time, the working state of the solenoid valve cannot be determined by the power chip U2. A control signal is sent to the shedding detection circuit through the main control microcontroller U1. The shedding detection circuit provides a trigger current to the control end of the solenoid valve according to the control signal. The trigger current is a small current and cannot control the opening of the solenoid valve. However, the power chip U2 can identify the trigger current and form a feedback voltage. At this time, the main control microcontroller U1 can determine the working state of the solenoid valve according to the feedback voltage, and can determine whether there is a fault in the solenoid valve when the system is powered on. The feedback voltage can include the solenoid valve shedding voltage, the solenoid valve short-circuit voltage to the power supply, the solenoid valve voltage to the ground, etc. The state of the solenoid valve can be determined according to different voltage values, including whether the solenoid valve is shedding, whether the solenoid valve is short-circuited to the power supply, whether the solenoid valve is short-circuited to the ground, etc.

[0039] The utility model can timely feedback the working status of the solenoid valve, so as to handle the fault of the solenoid valve early, so that when the lithium battery has thermal runaway, the fire extinguishing action can be accurately triggered, thereby improving the accuracy and timeliness of the triggering of the fire extinguishing action and avoiding loss of life and property.

[0040] The second aspect of the embodiment of the utility model provides an air-suction fire detection system, including a solenoid valve detection control circuit as in the first aspect, and the solenoid valve detection control circuit is mounted on a control host of the air-suction fire detection system. By mounting the solenoid valve detection control circuit in the air-suction fire detection system, state monitoring of the solenoid valve is achieved, so that early processing can be performed when a solenoid valve failure occurs, so that when a lithium battery has thermal runaway, a fire extinguishing action can be accurately triggered, thereby improving the accuracy and timeliness of the triggering of the fire extinguishing action and avoiding loss of life and property.

[0041] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several modifications and improvements can be made, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the utility model, and all of them belong to the protection scope of the utility model.

Claims

1. A solenoid valve detection control circuit, characterized in that: include: Main control microcontroller; A power chip, wherein the input end of the power chip is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve. The main control microcontroller controls the opening or closing of the solenoid valve by inputting a level control signal to the power chip, and determines the working state of the solenoid valve according to the feedback voltage of the power chip; A shedding detection circuit, wherein the input end of the shedding detection circuit is connected to the main control microcontroller, and the output end is connected to the control end of the solenoid valve, and is used to provide a trigger current to the control end of the solenoid valve according to the control signal of the main control microcontroller so that the power chip forms a feedback voltage for the main control microcontroller to obtain the working state of the solenoid valve; and The power module is used to provide operating voltage.

2. The solenoid valve detection control circuit according to claim 1, characterized in that: The power chip is connected to a load resistor, a first end of the load resistor is connected to the feedback end of the power chip, and a second end is grounded, and is used to convert a current signal at the output end of the power chip into a feedback voltage.

3. The solenoid valve detection control circuit according to claim 1, characterized in that: A first current limiting resistor is provided between the output end of the main control single chip microcomputer and the input end of the power chip.

4. The solenoid valve detection control circuit according to claim 2 or 3, characterized in that: A second current limiting resistor is connected between the feedback receiving end of the main control microcontroller and the feedback end of the power chip, and a filter capacitor is connected between the second current limiting resistor and the main control microcontroller. The second current limiting resistor and the filter capacitor constitute a filter circuit.

5. The solenoid valve detection control circuit according to claim 1, characterized in that: The fall-off detection circuit comprises: An optical coupler, the input end of the optical coupler is connected to the output end of the main control microcontroller; and A switch circuit, wherein the input end of the switch circuit is connected to the output end of the optical coupler, and the output end is connected to the control end of the solenoid valve.

6. The solenoid valve detection control circuit according to claim 5, characterized in that: The switch circuit comprises a transistor, the base of the transistor is connected to the output end of the optical coupler, the emitter is connected to the power module, and the collector is connected to the control end of the electromagnetic valve.

7. An air-suction fire detection system, characterized in that: It comprises the solenoid valve detection control circuit as described in any one of claims 1-6.

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